Congressman Steve King (best friend of Bachmann) says the first bill out of the chute with the new congress will be the full repeal of Obamacare.
The best Republicans in the House can do is not fund Obamacare. However, no one knows for sure how that process can be fully or partially accomplished at this point. Having said that, defunding is the ONLY option for the GOP House at this point to turn off the money for Obamacare.